Hammer



FIG. 1 is a top, front and side perspective view of a hammer showing our new design;

FIG. 2 is a side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is an opposite side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines on the head and grip of the hammer are contour shaping lines and form part of the claimed design. 

The ornamental design for a hammer, as shown and described. 